Hello,

I would like to create lagged and delta variables from a set of variables
and then add them to a dataframe

Suppose that GDPPcSa is a variable. I would like to be able to do this

QuarterlyData$D1GdpPcSa = diff(GDPPcSa , 1)

in an automated fashion so that I loop over Quartely data to compute the
first difference  of its variables and add them to the dataframe.

.It would be great to get a way to create the string "D1GdpPcSa" knowing
that the name of the var is GdpPcSa. Then I can add the varibale  D1GdpPcSa
to the dataframe and work on its names attribute.

Thanks

Paolo

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